Labels/identities have devastating psychological effects, they could puff up a false sense of pride, they could blind you with a distorted view, and they could limit your mental capacity by defining you with this one trait only and excluding everything else. We all have multiple identities, which can be divided into collective/group identities (such as gender, ethnicity, religion, political affiliation, nationality, social status), social/relational identities (such as being a relative to someone in your family, an employee of a certain company, a member of a certain organization, a resident of a certain neighborhood, a student of a certain school) and individual/personal identities (personality, appearance, reputation, achievements, job title, possessions, skills, educational level). Note that individual/personal identities are the only ones that distinguish you from other people, and they usually require great effort from you to be made; collective/group identities are usually natural, you're born with such identities.
So here's the thing. When a normal person introduces himself, individual/personal identities should come first; social/relational identities follow, then collective/group identities at last. But in a mentally sick society filled with mentally sick people, this order is reversed, collective/group identities often come first, they puff you up and give you a false sense of pride, you become judgemental both to others and yourself, you think of yourself with your collective identities first and foremost, and you begin to force others to recognize your collective/group identities first and foremost. Such identities are also weaponized as both a shield and a sword. You don't take personal responsibilities any more, you hide behind your collective identities. If somebody targets your individual identities by holding your accountable for something you've done wrong, you accuse them of attacking your collective identities, of them being a sexist, racist, Trump supporter, etc, you know the drill. This sense of pride is showing in your perception of Jews, Gentiles and Christians.